SU150143A1 - The twisting method of a flat pair of telephone cable wires - Google Patents

Description

In connection with the scarcity of copper, replacement of copper wires in urban telephone cables of a pair twist with aluminum is being made.

For electric section equivalence, aluminum cores of a larger diameter, namely 0.65 mm, are used instead of copper cores with a diameter of 0.5 mm. However, despite the larger diameter, the strands are very fragile, stretched and torn during the manufacturing process of the telephone pair: firstly, when the bare aluminum strand is insulated with plastic on a syringe press; secondly, when twisting two isolated veins into pairs on steam-twisting machines.

In connection with this, ohmic asymmetry and breakage of the veins in the finished cable appear in pairs with extruded aluminum conductors.

A further increase in the diameter of the aluminum conductor cable for the sake of giving them greater mechanical strength is inexpedient and uneconomical, firstly because the dimensions of the cable increase dramatically, which will make it difficult to pull in the sewage units, and secondly, the consumption of insulation materials and materials on the protective shell.

The proposed method of twisting a flat pair of telephone cable strands eliminates the stretching and breakage of the wires in the process of making a flat cable pair.

These advantages are achieved by the fact that a flat pair of cores, wound in a spiral on a tapered spindle, is served by a diverting knife on two parallel rods and using a screw ridge on one of the shthangs, the helix is advanced along the shthang to a predetermined length receiving

twisted pair and last wound on the drum in a twisted form. To change the pitch of a flat pair, use tapered spindles of various diameters,

FIG. Figure 1 shows the process of making a flat telephone pair and twisting it according to the proposed method; in fig. 2 - winding a flat pair in a spiral on the machine.

The insulated pair of wires /, the exit from the syringe press 2 with applied insulation 3, passes the cooling bath 4 and enters the tapered spindle 5, which rotates the pair into a spiral 6, the latter is transported along parallel rods 7 with a screw ridge 5 on one of shtang.

The advantage of the proposed method is that on. In a spiral, an insulated pair of aluminum conductors is twisted without straightening and breakage of the current-carrying conductors while straightening.

Subject invention

Claims (2)

1. A method of twisting a flat pair of telephone cable cores while simultaneously isolating two current-carrying cores, carried out by winding a flat pair onto a rotating cone shpindel, characterized in that, in order to avoid stretching and breakage of the current-carrying cores. in the process of making a flat pair of cable, a flat pair wound into a spiral is fed from said pinch with a pull-out knife to two parallel shanks and using a screw ridge on one of the rods the helix is pushed along the schtang and for a given length, to obtain a twisted pair and the latter is wound onto a drum in a twisted form. 2. A method according to claim 1, characterized in that, in order to change the twist pitch of a flat pair, cone spindles of different diameters are used.